Answer:
Around 91.38
Step-by-step explanation:
26.5 x 100/29 = 91.38

The equation of circle in standard form can be represented as :

where,
- h = x - coordinate of centre = 0
- k = y - coordinate of centre = 0
- r = radius of circle = 6 units
now, let's plug in the values :


That's the required equation of circle.
i think the answer is c, hope this helps ;)